Well, I had an interesting day of visiting 4 AZs in the Minneapolis area.
It is very hit/miss, and the specials are store-specific. Had conversations with 3 different store managers, and it was very cordial. In my 2nd store, I managed a 5 quart jug of Castrol and a 5 qt jug of Havoline for 5.00. It was at this store, that the manager asked me "are you one of those guys from BITOG"? He was laughing as apparently met someone this weekend, who schooled him on oil.
I guess this store actually oversold 54 quarts of Castrol, and has to figure out a plan for the customers who ordered for store pick up.
The 3rd store had nothing, and the 4th store I scored quarts of Kendall (not typically seen in Mpls). Also, ALL the stores are clearing out the Valvoline ATF fluids for 1.00. Thus, I have my Tahoe's spring tranny service accounted for.
Good luck. If you like Royal Purple, you may find some yet..
M1 EP 0/20 looks to be readily available.